Are you placing your gearsets on a hotbar? What I do, to make switching easier, is to have vertical hotbars set up on the right hand side of my screen. On those hotbars are icons for all the classes I have (currently 15-16, I can't remember). When I need to switch classes, I simply hit the corresponding number and BAM, switched.

In case you're not sure how to do it, go into Character > Gearsets and drag the gearset icon to the hotbar.

You'll still have to stop crafting but at least this method eliminates the step of having to go into the Character screen every time.